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um: Prevent KASAN splats in dump_stack()

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Use READ_ONCE_NOCHECK() when reading the stack to prevent KASAN splats
when dump_stack() is used.

Fixes: 5b301409e8bc5d7fad ("UML: add support for KASAN under x86_64")
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Vincent Whitchurch 2022-09-07 12:05:33 +02:00 committed by Richard Weinberger
parent 782b1f70f8
commit 2975e4a282
1 changed files with 2 additions and 1 deletions
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3
arch/um/kernel/sysrq.c
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@ -48,7 +48,8 @@ void show_stack(struct task_struct *task, unsigned long *stack,
break;
if (i && ((i % STACKSLOTS_PER_LINE) == 0))
pr_cont("\n");
pr_cont(" %08lx", *stack++);
pr_cont(" %08lx", READ_ONCE_NOCHECK(*stack));
stack++;
}
printk("%sCall Trace:\n", loglvl);